Kudos to the boy who ate his greens, did his homework, and eventually wrote Lemmings in DHTML; it's an amazing rendition and really shows off what a noddy programming language + dedication can achieve:

http://193.151.73.87/games/lemmings/index.html

tips:
dont even think about it on a <1ghz pc

if you are well up on copyright law, the author could do with some help, as there's (there're?) a few people wanting to climb all over him at the moment..